#include <stdio.h>

void swapNumber(int *a, int *b);

main()
{
	int x = 5, y = 3;
	printf("x = %2d, y = %2d\n", x, y);
	swapNumber(&x, &y);
	printf("x = %2d, y = %2d\n", x, y);
}

void swapNumber(int *a, int *b)
{
	int temp;
	temp = *a;
	*a = *b;
	*b = temp;
}